Picture frame



FIG. 1 is an isometric view of a front, top, and right side of an ornamental design for a picture frame;

FIG. 2 is a front elevational view of the picture frame of FIG. 1;

FIG. 3 is a rear elevational view of the picture frame of FIG. 1;

FIG. 4 is a right side elevational view of the picture frame of FIG. 1;

FIG. 5 is a left side elevational view of the picture frame of FIG. 1;

FIG. 6 is a top plan view of the picture frame of FIG. 1; and,

FIG. 7 is a bottom plan view of the picture frame of FIG. 1.

The broken lines shown in the drawings are included for the purpose of illustrating portions of the picture frame that form no part of the claimed design. 

CLAIM The ornamental design for a picture frame, as shown and described. 